This is simpler than having to proxy the action (and target) for the button.
Previously the button was created on demand, but now that we always create it (and hide it when not required), we might as well have users set action and target directly on the button instance.
This fixes problems with symbolic links, for example file browser may show contents of /private/tmp when we ask to select /tmp/foo.txt. Comparing file path URLs will fail even though /tmp is a symbolic link for /private/tmp.
Note that this fix only works for when the current document is already part of the items in the file browser, as we still store pending URLs to select as file path URLs.
Terminal.app is peculiar about what it expects to be on the clipboard. If we only write URLs like this:
[pboard clearContents];
[pboard writeObjects:urls];
Then it will not paste anything. There *must* be string fallbacks for it to support paste. But if we also write an array of strings like this:
[pboard clearContents];
[pboard writeObjects:urls];
[pboard writeObjects:[urls valueForKeyPath:@"path.lastPathComponent"]];
Then it will paste both the URLs and the strings, but where the URLs will be space-separated, the strings will not. If instead we write a single string fallback only for the first item, like this:
[pboard clearContents];
[pboard writeObjects:urls];
[pboard setString:@"whatever" forType:NSPasteboardTypeString];
Then it will paste the URLs and ignore the string fallback for the first URL.
This is to make it easier to support Cocoa’s native resume feature, as for this, we should keep all state in the controller, but also, the controller should be able to know if view state changes, for example expanded/selected items in the outline view, which require our controller to be the delegate.
For example if we have a directory with files named 001-foo.txt, 002-bar.txt, and 003-fud.txt, duplicating one of these will result in the duplicate starting with 004.
Also improve support for finding dates in file names being duplicated. Previously we only looked for YYYY-MM-DD but now we also support YYYY_MM_DD and YYYYMMDD. If a date is found in the file name being duplicated, it is replaced with the current date in the duplicate.
